Fix tests due to Twig deprecations

Author: wouterj

.travis.yml

@@ -37,7 +37,7 @@ before_install:
   - if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then echo "memory_limit = -1" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini; fi
   - composer self-update
   - composer require symfony/symfony:${SYMFONY_VERSION} --no-update
-    
+
 install: composer update $COMPOSER_FLAGS --prefer-dist
 
 script: phpunit --coverage-text